87 lines
3.0 KiB
C++
87 lines
3.0 KiB
C++
#include <cstring>
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#include "traceback.hpp"
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#define TRACEBACK_LEVELS1 12
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#define TRACEBACK_LEVELS2 10
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// Call this with the error message on top of the stack.
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// The error message is replaced with a traceback.
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//
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int traceback_coroutine(lua_State *L) {
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int top = lua_gettop(L);
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// Convert message to a string
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if (!lua_tostring(L, top)) {
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luaL_callmeta(L, top, "__tostring");
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// If callmeta didn't produce exactly one string, clear the stack
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// and push "unknown error"
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if ((lua_gettop(L) == top + 1) && (lua_tostring(L, -1))) {
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lua_remove(L, top);
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} else {
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lua_settop(L, top - 1);
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lua_pushstring(L, "unknown error");
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}
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}
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// Append the traceback.
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lua_Debug ar;
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int firstpart = 1;
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bool any = false;
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for (int level = 0; lua_getstack(L, level, &ar); level++) {
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if (level > TRACEBACK_LEVELS1 && firstpart) {
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/* no more than `LEVELS2' more levels? */
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if (!lua_getstack(L, level + TRACEBACK_LEVELS2, &ar))
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level--; /* keep going */
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else {
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lua_pushliteral(L, "\n\t..."); /* too many levels */
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while (lua_getstack(L, level + TRACEBACK_LEVELS2, &ar)) /* find last levels */
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level++;
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}
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firstpart = 0;
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continue;
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}
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lua_getinfo(L, "Snl", &ar);
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if ((!any) && (*ar.what == 'C') && (ar.name != 0)) {
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if (strcmp(ar.name, "__newindex") == 0) continue;
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}
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if ((ar.currentline > 0) || (*ar.namewhat != 0) || (*ar.what != 'C')) {
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any = true;
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lua_pushliteral(L, "\n\t");
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lua_pushfstring(L, "%s:", ar.short_src);
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if (ar.currentline > 0)
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lua_pushfstring(L, "%d:", ar.currentline);
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if (*ar.namewhat != '\0') /* is there a name? */
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lua_pushfstring(L, " in function " LUA_QS, ar.name);
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else {
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if (*ar.what == 'm') /* main? */
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lua_pushfstring(L, " in main chunk");
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else if (*ar.what == 'C' || *ar.what == 't')
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lua_pushliteral(L, " ?"); /* C function or tail call */
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else
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lua_pushfstring(L, " in function <%s:%d>",
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ar.short_src, ar.linedefined);
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}
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if (1 + lua_gettop(L) - top > 5) {
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lua_concat(L, 1 + lua_gettop(L) - top);
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}
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}
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}
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lua_pushstring(L, "\n");
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if (1 + lua_gettop(L) - top > 1) {
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lua_concat(L, 1 + lua_gettop(L) - top);
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}
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return 1;
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}
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int traceback_pcall(lua_State *L, int narg, int nret) {
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int status;
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int base = lua_gettop(L) - narg; /* function index */
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lua_pushcfunction(L, traceback_coroutine); /* push traceback function */
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lua_insert(L, base); /* put it under chunk and args */
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status = lua_pcall(L, narg, nret, base);
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lua_remove(L, base); /* remove traceback function */
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return status;
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}
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