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1866
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1 /*
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2 ** $Id: ldebug.c,v 2.90 2012/08/16 17:34:28 roberto Exp $
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3 ** Debug Interface
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4 ** See Copyright Notice in lua.h
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5 */
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6
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7
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8 #include <stdarg.h>
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9 #include <stddef.h>
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10 #include <string.h>
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11
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12
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13 #define ldebug_c
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14 #define LUA_CORE
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15
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16 #include "lua.h"
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17
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18 #include "lapi.h"
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19 #include "lcode.h"
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20 #include "ldebug.h"
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21 #include "ldo.h"
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22 #include "lfunc.h"
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23 #include "lobject.h"
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24 #include "lopcodes.h"
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25 #include "lstate.h"
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26 #include "lstring.h"
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27 #include "ltable.h"
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28 #include "ltm.h"
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29 #include "lvm.h"
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30
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31
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32
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33 #define noLuaClosure(f) ((f) == NULL || (f)->c.tt == LUA_TCCL)
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34
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35
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36 static const char *getfuncname (lua_State *L, CallInfo *ci, const char **name);
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37
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38
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39 static int currentpc (CallInfo *ci) {
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40 lua_assert(isLua(ci));
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41 return pcRel(ci->u.l.savedpc, ci_func(ci)->p);
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42 }
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43
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44
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45 static int currentline (CallInfo *ci) {
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46 return getfuncline(ci_func(ci)->p, currentpc(ci));
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47 }
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48
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49
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50 /*
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51 ** this function can be called asynchronous (e.g. during a signal)
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52 */
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53 LUA_API int lua_sethook (lua_State *L, lua_Hook func, int mask, int count) {
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54 if (func == NULL || mask == 0) { /* turn off hooks? */
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55 mask = 0;
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56 func = NULL;
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57 }
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58 if (isLua(L->ci))
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59 L->oldpc = L->ci->u.l.savedpc;
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60 L->hook = func;
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61 L->basehookcount = count;
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62 resethookcount(L);
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63 L->hookmask = cast_byte(mask);
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64 return 1;
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65 }
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66
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67
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68 LUA_API lua_Hook lua_gethook (lua_State *L) {
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69 return L->hook;
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70 }
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71
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72
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73 LUA_API int lua_gethookmask (lua_State *L) {
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74 return L->hookmask;
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75 }
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76
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77
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78 LUA_API int lua_gethookcount (lua_State *L) {
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79 return L->basehookcount;
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80 }
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81
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82
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83 LUA_API int lua_getstack (lua_State *L, int level, lua_Debug *ar) {
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84 int status;
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85 CallInfo *ci;
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86 if (level < 0) return 0; /* invalid (negative) level */
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87 lua_lock(L);
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88 for (ci = L->ci; level > 0 && ci != &L->base_ci; ci = ci->previous)
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89 level--;
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90 if (level == 0 && ci != &L->base_ci) { /* level found? */
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91 status = 1;
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92 ar->i_ci = ci;
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93 }
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94 else status = 0; /* no such level */
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95 lua_unlock(L);
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96 return status;
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97 }
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98
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99
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100 static const char *upvalname (Proto *p, int uv) {
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101 TString *s = check_exp(uv < p->sizeupvalues, p->upvalues[uv].name);
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102 if (s == NULL) return "?";
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103 else return getstr(s);
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104 }
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105
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106
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107 static const char *findvararg (CallInfo *ci, int n, StkId *pos) {
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108 int nparams = clLvalue(ci->func)->p->numparams;
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109 if (n >= ci->u.l.base - ci->func - nparams)
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110 return NULL; /* no such vararg */
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111 else {
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112 *pos = ci->func + nparams + n;
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113 return "(*vararg)"; /* generic name for any vararg */
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114 }
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115 }
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116
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117
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118 static const char *findlocal (lua_State *L, CallInfo *ci, int n,
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119 StkId *pos) {
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120 const char *name = NULL;
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121 StkId base;
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122 if (isLua(ci)) {
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123 if (n < 0) /* access to vararg values? */
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124 return findvararg(ci, -n, pos);
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125 else {
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126 base = ci->u.l.base;
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127 name = luaF_getlocalname(ci_func(ci)->p, n, currentpc(ci));
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128 }
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129 }
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130 else
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131 base = ci->func + 1;
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132 if (name == NULL) { /* no 'standard' name? */
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133 StkId limit = (ci == L->ci) ? L->top : ci->next->func;
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134 if (limit - base >= n && n > 0) /* is 'n' inside 'ci' stack? */
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135 name = "(*temporary)"; /* generic name for any valid slot */
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136 else
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137 return NULL; /* no name */
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138 }
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139 *pos = base + (n - 1);
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140 return name;
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141 }
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142
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143
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144 LUA_API const char *lua_getlocal (lua_State *L, const lua_Debug *ar, int n) {
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145 const char *name;
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146 lua_lock(L);
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147 if (ar == NULL) { /* information about non-active function? */
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148 if (!isLfunction(L->top - 1)) /* not a Lua function? */
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149 name = NULL;
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150 else /* consider live variables at function start (parameters) */
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151 name = luaF_getlocalname(clLvalue(L->top - 1)->p, n, 0);
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152 }
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153 else { /* active function; get information through 'ar' */
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154 StkId pos = 0; /* to avoid warnings */
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155 name = findlocal(L, ar->i_ci, n, &pos);
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156 if (name) {
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157 setobj2s(L, L->top, pos);
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158 api_incr_top(L);
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159 }
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160 }
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161 lua_unlock(L);
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162 return name;
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163 }
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164
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165
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166 LUA_API const char *lua_setlocal (lua_State *L, const lua_Debug *ar, int n) {
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167 StkId pos = 0; /* to avoid warnings */
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168 const char *name = findlocal(L, ar->i_ci, n, &pos);
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169 lua_lock(L);
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170 if (name)
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171 setobjs2s(L, pos, L->top - 1);
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172 L->top--; /* pop value */
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173 lua_unlock(L);
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174 return name;
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175 }
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176
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177
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178 static void funcinfo (lua_Debug *ar, Closure *cl) {
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179 if (noLuaClosure(cl)) {
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180 ar->source = "=[C]";
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181 ar->linedefined = -1;
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182 ar->lastlinedefined = -1;
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183 ar->what = "C";
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184 }
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185 else {
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186 Proto *p = cl->l.p;
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187 ar->source = p->source ? getstr(p->source) : "=?";
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188 ar->linedefined = p->linedefined;
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189 ar->lastlinedefined = p->lastlinedefined;
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190 ar->what = (ar->linedefined == 0) ? "main" : "Lua";
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191 }
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192 luaO_chunkid(ar->short_src, ar->source, LUA_IDSIZE);
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193 }
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194
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195
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196 static void collectvalidlines (lua_State *L, Closure *f) {
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197 if (noLuaClosure(f)) {
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198 setnilvalue(L->top);
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199 api_incr_top(L);
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200 }
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201 else {
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202 int i;
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203 TValue v;
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204 int *lineinfo = f->l.p->lineinfo;
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205 Table *t = luaH_new(L); /* new table to store active lines */
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206 sethvalue(L, L->top, t); /* push it on stack */
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207 api_incr_top(L);
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208 setbvalue(&v, 1); /* boolean 'true' to be the value of all indices */
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209 for (i = 0; i < f->l.p->sizelineinfo; i++) /* for all lines with code */
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210 luaH_setint(L, t, lineinfo[i], &v); /* table[line] = true */
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211 }
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212 }
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213
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214
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215 static int auxgetinfo (lua_State *L, const char *what, lua_Debug *ar,
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216 Closure *f, CallInfo *ci) {
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217 int status = 1;
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218 for (; *what; what++) {
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219 switch (*what) {
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220 case 'S': {
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221 funcinfo(ar, f);
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222 break;
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223 }
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224 case 'l': {
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225 ar->currentline = (ci && isLua(ci)) ? currentline(ci) : -1;
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226 break;
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227 }
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228 case 'u': {
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229 ar->nups = (f == NULL) ? 0 : f->c.nupvalues;
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230 if (noLuaClosure(f)) {
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231 ar->isvararg = 1;
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232 ar->nparams = 0;
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233 }
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234 else {
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235 ar->isvararg = f->l.p->is_vararg;
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236 ar->nparams = f->l.p->numparams;
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237 }
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238 break;
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239 }
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240 case 't': {
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241 ar->istailcall = (ci) ? ci->callstatus & CIST_TAIL : 0;
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242 break;
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243 }
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244 case 'n': {
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245 /* calling function is a known Lua function? */
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246 if (ci && !(ci->callstatus & CIST_TAIL) && isLua(ci->previous))
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247 ar->namewhat = getfuncname(L, ci->previous, &ar->name);
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248 else
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249 ar->namewhat = NULL;
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250 if (ar->namewhat == NULL) {
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251 ar->namewhat = ""; /* not found */
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252 ar->name = NULL;
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253 }
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254 break;
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255 }
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256 case 'L':
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257 case 'f': /* handled by lua_getinfo */
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258 break;
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259 default: status = 0; /* invalid option */
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260 }
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261 }
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262 return status;
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263 }
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264
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265
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266 LUA_API int lua_getinfo (lua_State *L, const char *what, lua_Debug *ar) {
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267 int status;
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268 Closure *cl;
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269 CallInfo *ci;
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270 StkId func;
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271 lua_lock(L);
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272 if (*what == '>') {
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273 ci = NULL;
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274 func = L->top - 1;
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275 api_check(L, ttisfunction(func), "function expected");
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276 what++; /* skip the '>' */
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277 L->top--; /* pop function */
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278 }
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279 else {
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280 ci = ar->i_ci;
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281 func = ci->func;
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282 lua_assert(ttisfunction(ci->func));
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283 }
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284 cl = ttisclosure(func) ? clvalue(func) : NULL;
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285 status = auxgetinfo(L, what, ar, cl, ci);
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286 if (strchr(what, 'f')) {
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287 setobjs2s(L, L->top, func);
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288 api_incr_top(L);
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289 }
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290 if (strchr(what, 'L'))
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291 collectvalidlines(L, cl);
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292 lua_unlock(L);
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293 return status;
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294 }
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295
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296
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297 /*
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298 ** {======================================================
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299 ** Symbolic Execution
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300 ** =======================================================
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301 */
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302
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303 static const char *getobjname (Proto *p, int lastpc, int reg,
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304 const char **name);
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305
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306
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307 /*
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308 ** find a "name" for the RK value 'c'
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309 */
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310 static void kname (Proto *p, int pc, int c, const char **name) {
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311 if (ISK(c)) { /* is 'c' a constant? */
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312 TValue *kvalue = &p->k[INDEXK(c)];
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313 if (ttisstring(kvalue)) { /* literal constant? */
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314 *name = svalue(kvalue); /* it is its own name */
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315 return;
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316 }
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317 /* else no reasonable name found */
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318 }
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319 else { /* 'c' is a register */
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320 const char *what = getobjname(p, pc, c, name); /* search for 'c' */
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321 if (what && *what == 'c') { /* found a constant name? */
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322 return; /* 'name' already filled */
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323 }
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324 /* else no reasonable name found */
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325 }
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326 *name = "?"; /* no reasonable name found */
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327 }
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328
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329
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330 /*
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331 ** try to find last instruction before 'lastpc' that modified register 'reg'
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332 */
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333 static int findsetreg (Proto *p, int lastpc, int reg) {
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334 int pc;
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335 int setreg = -1; /* keep last instruction that changed 'reg' */
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336 for (pc = 0; pc < lastpc; pc++) {
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337 Instruction i = p->code[pc];
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338 OpCode op = GET_OPCODE(i);
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339 int a = GETARG_A(i);
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340 switch (op) {
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341 case OP_LOADNIL: {
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342 int b = GETARG_B(i);
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343 if (a <= reg && reg <= a + b) /* set registers from 'a' to 'a+b' */
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344 setreg = pc;
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345 break;
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346 }
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347 case OP_TFORCALL: {
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348 if (reg >= a + 2) setreg = pc; /* affect all regs above its base */
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349 break;
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350 }
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351 case OP_CALL:
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352 case OP_TAILCALL: {
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353 if (reg >= a) setreg = pc; /* affect all registers above base */
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354 break;
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355 }
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356 case OP_JMP: {
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357 int b = GETARG_sBx(i);
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358 int dest = pc + 1 + b;
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359 /* jump is forward and do not skip `lastpc'? */
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360 if (pc < dest && dest <= lastpc)
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361 pc += b; /* do the jump */
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362 break;
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363 }
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364 case OP_TEST: {
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365 if (reg == a) setreg = pc; /* jumped code can change 'a' */
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366 break;
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367 }
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368 default:
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369 if (testAMode(op) && reg == a) /* any instruction that set A */
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370 setreg = pc;
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371 break;
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372 }
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373 }
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374 return setreg;
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375 }
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376
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377
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378 static const char *getobjname (Proto *p, int lastpc, int reg,
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379 const char **name) {
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380 int pc;
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381 *name = luaF_getlocalname(p, reg + 1, lastpc);
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382 if (*name) /* is a local? */
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383 return "local";
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384 /* else try symbolic execution */
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385 pc = findsetreg(p, lastpc, reg);
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386 if (pc != -1) { /* could find instruction? */
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387 Instruction i = p->code[pc];
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388 OpCode op = GET_OPCODE(i);
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389 switch (op) {
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390 case OP_MOVE: {
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391 int b = GETARG_B(i); /* move from 'b' to 'a' */
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392 if (b < GETARG_A(i))
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393 return getobjname(p, pc, b, name); /* get name for 'b' */
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394 break;
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395 }
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396 case OP_GETTABUP:
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397 case OP_GETTABLE: {
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398 int k = GETARG_C(i); /* key index */
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399 int t = GETARG_B(i); /* table index */
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400 const char *vn = (op == OP_GETTABLE) /* name of indexed variable */
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401 ? luaF_getlocalname(p, t + 1, pc)
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402 : upvalname(p, t);
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403 kname(p, pc, k, name);
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404 return (vn && strcmp(vn, LUA_ENV) == 0) ? "global" : "field";
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405 }
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406 case OP_GETUPVAL: {
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407 *name = upvalname(p, GETARG_B(i));
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408 return "upvalue";
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409 }
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410 case OP_LOADK:
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411 case OP_LOADKX: {
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412 int b = (op == OP_LOADK) ? GETARG_Bx(i)
|
|
|
413 : GETARG_Ax(p->code[pc + 1]);
|
|
|
414 if (ttisstring(&p->k[b])) {
|
|
|
415 *name = svalue(&p->k[b]);
|
|
|
416 return "constant";
|
|
|
417 }
|
|
|
418 break;
|
|
|
419 }
|
|
|
420 case OP_SELF: {
|
|
|
421 int k = GETARG_C(i); /* key index */
|
|
|
422 kname(p, pc, k, name);
|
|
|
423 return "method";
|
|
|
424 }
|
|
|
425 default: break; /* go through to return NULL */
|
|
|
426 }
|
|
|
427 }
|
|
|
428 return NULL; /* could not find reasonable name */
|
|
|
429 }
|
|
|
430
|
|
|
431
|
|
|
432 static const char *getfuncname (lua_State *L, CallInfo *ci, const char **name) {
|
|
|
433 TMS tm;
|
|
|
434 Proto *p = ci_func(ci)->p; /* calling function */
|
|
|
435 int pc = currentpc(ci); /* calling instruction index */
|
|
|
436 Instruction i = p->code[pc]; /* calling instruction */
|
|
|
437 switch (GET_OPCODE(i)) {
|
|
|
438 case OP_CALL:
|
|
|
439 case OP_TAILCALL: /* get function name */
|
|
|
440 return getobjname(p, pc, GETARG_A(i), name);
|
|
|
441 case OP_TFORCALL: { /* for iterator */
|
|
|
442 *name = "for iterator";
|
|
|
443 return "for iterator";
|
|
|
444 }
|
|
|
445 /* all other instructions can call only through metamethods */
|
|
|
446 case OP_SELF:
|
|
|
447 case OP_GETTABUP:
|
|
|
448 case OP_GETTABLE: tm = TM_INDEX; break;
|
|
|
449 case OP_SETTABUP:
|
|
|
450 case OP_SETTABLE: tm = TM_NEWINDEX; break;
|
|
|
451 case OP_EQ: tm = TM_EQ; break;
|
|
|
452 case OP_ADD: tm = TM_ADD; break;
|
|
|
453 case OP_SUB: tm = TM_SUB; break;
|
|
|
454 case OP_MUL: tm = TM_MUL; break;
|
|
|
455 case OP_DIV: tm = TM_DIV; break;
|
|
|
456 case OP_MOD: tm = TM_MOD; break;
|
|
|
457 case OP_POW: tm = TM_POW; break;
|
|
|
458 case OP_UNM: tm = TM_UNM; break;
|
|
|
459 case OP_LEN: tm = TM_LEN; break;
|
|
|
460 case OP_LT: tm = TM_LT; break;
|
|
|
461 case OP_LE: tm = TM_LE; break;
|
|
|
462 case OP_CONCAT: tm = TM_CONCAT; break;
|
|
|
463 default:
|
|
|
464 return NULL; /* else no useful name can be found */
|
|
|
465 }
|
|
|
466 *name = getstr(G(L)->tmname[tm]);
|
|
|
467 return "metamethod";
|
|
|
468 }
|
|
|
469
|
|
|
470 /* }====================================================== */
|
|
|
471
|
|
|
472
|
|
|
473
|
|
|
474 /*
|
|
|
475 ** only ANSI way to check whether a pointer points to an array
|
|
|
476 ** (used only for error messages, so efficiency is not a big concern)
|
|
|
477 */
|
|
|
478 static int isinstack (CallInfo *ci, const TValue *o) {
|
|
|
479 StkId p;
|
|
|
480 for (p = ci->u.l.base; p < ci->top; p++)
|
|
|
481 if (o == p) return 1;
|
|
|
482 return 0;
|
|
|
483 }
|
|
|
484
|
|
|
485
|
|
|
486 static const char *getupvalname (CallInfo *ci, const TValue *o,
|
|
|
487 const char **name) {
|
|
|
488 LClosure *c = ci_func(ci);
|
|
|
489 int i;
|
|
|
490 for (i = 0; i < c->nupvalues; i++) {
|
|
|
491 if (c->upvals[i]->v == o) {
|
|
|
492 *name = upvalname(c->p, i);
|
|
|
493 return "upvalue";
|
|
|
494 }
|
|
|
495 }
|
|
|
496 return NULL;
|
|
|
497 }
|
|
|
498
|
|
|
499
|
|
|
500 l_noret luaG_typeerror (lua_State *L, const TValue *o, const char *op) {
|
|
|
501 CallInfo *ci = L->ci;
|
|
|
502 const char *name = NULL;
|
|
|
503 const char *t = objtypename(o);
|
|
|
504 const char *kind = NULL;
|
|
|
505 if (isLua(ci)) {
|
|
|
506 kind = getupvalname(ci, o, &name); /* check whether 'o' is an upvalue */
|
|
|
507 if (!kind && isinstack(ci, o)) /* no? try a register */
|
|
|
508 kind = getobjname(ci_func(ci)->p, currentpc(ci),
|
|
|
509 cast_int(o - ci->u.l.base), &name);
|
|
|
510 }
|
|
|
511 if (kind)
|
|
|
512 luaG_runerror(L, "attempt to %s %s " LUA_QS " (a %s value)",
|
|
|
513 op, kind, name, t);
|
|
|
514 else
|
|
|
515 luaG_runerror(L, "attempt to %s a %s value", op, t);
|
|
|
516 }
|
|
|
517
|
|
|
518
|
|
|
519 l_noret luaG_concaterror (lua_State *L, StkId p1, StkId p2) {
|
|
|
520 if (ttisstring(p1) || ttisnumber(p1)) p1 = p2;
|
|
|
521 lua_assert(!ttisstring(p1) && !ttisnumber(p2));
|
|
|
522 luaG_typeerror(L, p1, "concatenate");
|
|
|
523 }
|
|
|
524
|
|
|
525
|
|
|
526 l_noret luaG_aritherror (lua_State *L, const TValue *p1, const TValue *p2) {
|
|
|
527 TValue temp;
|
|
|
528 if (luaV_tonumber(p1, &temp) == NULL)
|
|
|
529 p2 = p1; /* first operand is wrong */
|
|
|
530 luaG_typeerror(L, p2, "perform arithmetic on");
|
|
|
531 }
|
|
|
532
|
|
|
533
|
|
|
534 l_noret luaG_ordererror (lua_State *L, const TValue *p1, const TValue *p2) {
|
|
|
535 const char *t1 = objtypename(p1);
|
|
|
536 const char *t2 = objtypename(p2);
|
|
|
537 if (t1 == t2)
|
|
|
538 luaG_runerror(L, "attempt to compare two %s values", t1);
|
|
|
539 else
|
|
|
540 luaG_runerror(L, "attempt to compare %s with %s", t1, t2);
|
|
|
541 }
|
|
|
542
|
|
|
543
|
|
|
544 static void addinfo (lua_State *L, const char *msg) {
|
|
|
545 CallInfo *ci = L->ci;
|
|
|
546 if (isLua(ci)) { /* is Lua code? */
|
|
|
547 char buff[LUA_IDSIZE]; /* add file:line information */
|
|
|
548 int line = currentline(ci);
|
|
|
549 TString *src = ci_func(ci)->p->source;
|
|
|
550 if (src)
|
|
|
551 luaO_chunkid(buff, getstr(src), LUA_IDSIZE);
|
|
|
552 else { /* no source available; use "?" instead */
|
|
|
553 buff[0] = '?'; buff[1] = '\0';
|
|
|
554 }
|
|
|
555 luaO_pushfstring(L, "%s:%d: %s", buff, line, msg);
|
|
|
556 }
|
|
|
557 }
|
|
|
558
|
|
|
559
|
|
|
560 l_noret luaG_errormsg (lua_State *L) {
|
|
|
561 if (L->errfunc != 0) { /* is there an error handling function? */
|
|
|
562 StkId errfunc = restorestack(L, L->errfunc);
|
|
|
563 if (!ttisfunction(errfunc)) luaD_throw(L, LUA_ERRERR);
|
|
|
564 setobjs2s(L, L->top, L->top - 1); /* move argument */
|
|
|
565 setobjs2s(L, L->top - 1, errfunc); /* push function */
|
|
|
566 L->top++;
|
|
|
567 luaD_call(L, L->top - 2, 1, 0); /* call it */
|
|
|
568 }
|
|
|
569 luaD_throw(L, LUA_ERRRUN);
|
|
|
570 }
|
|
|
571
|
|
|
572
|
|
|
573 l_noret luaG_runerror (lua_State *L, const char *fmt, ...) {
|
|
|
574 va_list argp;
|
|
|
575 va_start(argp, fmt);
|
|
|
576 addinfo(L, luaO_pushvfstring(L, fmt, argp));
|
|
|
577 va_end(argp);
|
|
|
578 luaG_errormsg(L);
|
|
|
579 }
|
|
|
580
|
