static void _getCurrentStack(lua_State *L, utStack<stackinfo>& stack)
{
int top = lua_gettop(L);
lua_Debug lstack;
int stackFrame = 0;
MethodBase *lastMethod = NULL;
while (true)
{
// if we get a null result here, we are out of stack
if (!lua_getstack(L, stackFrame++, &lstack))
{
lua_settop(L, top);
return;
}
// something bad in denmark
if (!lua_getinfo(L, "fSl", &lstack))
{
lua_settop(L, top);
return;
}
bool cfunc = false;
if (lua_iscfunction(L, -1))
{
cfunc = true;
}
lua_rawgeti(L, LUA_GLOBALSINDEX, LSINDEXMETHODLOOKUP);
lua_pushvalue(L, -2);
lua_rawget(L, -2);
if (lua_isnil(L, -1))
{
lua_settop(L, top);
continue;
}
MethodBase *methodBase = (MethodBase *)lua_topointer(L, -1);
lua_settop(L, top);
// we only want the root call, not the pcall wrapper
if (cfunc && (lastMethod == methodBase))
{
continue;
}
lastMethod = methodBase;
stackinfo si;
si.methodBase = methodBase;
si.source = methodBase->isNative() ? "[NATIVE]" : lstack.source;
si.linenumber = lstack.currentline == -1 ? 0 : lstack.currentline;
stack.push(si);
}
}
// retrieve a Vector of callstack info, or nil in the case of an invalid stack
static int getCallStack(lua_State *L, EventType eventType)
{
int top = lua_gettop(L);
lua_Debug ar;
int nstack = 0;
_CallStackInfo cstack[MAX_CALLSTACK];
// look for method infos
for (int i = 0; i < MAX_CALLSTACK; i++)
{
// if we get a null result here, we are out of stack
if (!lua_getstack(L, i, &ar))
{
break;
}
// get function, source, and line
if (!lua_getinfo(L, "fSl", &ar))
{
continue;
}
// if we're a cfunction we're not interested in debugging it
// as we're a LoomScript debugger!
if (lua_iscfunction(L, -1))
{
lua_pop(L, 1);
// if we are at the top of the stack and we are not an assert event
// return a null stack as this isn't an interesting stack to the
// debugger
if (!i && (eventType != ASSERT_EVENT))
{
lua_pushnil(L);
return 1;
}
continue;
}
// lookup the stack frame's function in the global
// function table
lua_rawgeti(L, LUA_GLOBALSINDEX, LSINDEXMETHODLOOKUP);
lua_pushvalue(L, -2);
lua_rawget(L, -2);
// if we aren't found in the global functions
if (lua_isnil(L, -1))
{
// we are at the top of the stack, so this is an invalid stack
if (!i)
{
break;
}
lua_pop(L, 2);
continue;
}
// get the MethodBase
MethodBase *methodBase = (MethodBase *)lua_topointer(L, -1);
// if we're native and at the top of the stack, invalid stack
if (!i && methodBase->isNative())
{
break;
}
// if we should filter, we need to stop here
if (filterMethodBase(methodBase))
{
break;
}
// store out the stack info to our stack array
_CallStackInfo *cs = &cstack[nstack++];
cs->method = methodBase;
if (!methodBase->isNative())
{
cs->source = ar.source;
cs->line = ar.currentline;
}
else
{
cs->source = "[Native]";
cs->line = 0;
}
// early our for line events when we have no breakpoints
// and haven't hit a Debug.debug()
if (eventType == LINE_EVENT)
{
// check breakpoints
if (!i && !stepping)
{
// we only stop on a breakpoint
if (!hasBreakpoint(cs->source, cs->line) && !debugBreak)
{
lastSourceEvent[0] = 0;
lua_pushnil(L);
return 1;
}
}
}
lua_pop(L, 3);
// pop the function, methodbase, and methodlookup
}
lua_settop(L, top); // reset stack
// did we get anything, if not bail early
if (!nstack)
{
lua_pushnil(L);
return 1;
}
// check if the event is from the same line/source as last event
_CallStackInfo *cs = &cstack[0];
if (eventType == LINE_EVENT)
{
// we have a match, so bail
if (!strcmp(lastSourceEvent, cs->source) && (lastLineEvent == cs->line))
{
lua_pushnil(L);
return 1;
}
// cache for next line event
lmAssert(strlen(cs->source) < 2000, "source file > 2000 charaters");
strcpy(lastSourceEvent, cs->source);
lastLineEvent = cs->line;
}
else
{
// clear cached event
lastSourceEvent[0] = 0;
lastLineEvent = -1;
}
// We return a Vector.<CallStackInfo>
Type *vectorType = LSLuaState::getLuaState(L)->getType("system.Vector");
Type *csiType = LSLuaState::getLuaState(L)->getType(
"system.CallStackInfo");
int sourceOrdinal = csiType->getMemberOrdinal("source");
int lineOrdinal = csiType->getMemberOrdinal("line");
int methodOrdinal = csiType->getMemberOrdinal("method");
// create the vector instance
lsr_createinstance(L, vectorType);
lua_rawgeti(L, -1, LSINDEXVECTOR);
// now we need to loop through and setup our CallStackInfos and get them into our return vector
for (UTsize i = 0; i < (UTsize)nstack; i++)
{
cs = &cstack[i];
lua_pushnumber(L, i);
// note that system.CallStackInfo is not a native class, so we just fiddle
// it with indexes
lsr_createinstance(L, csiType);
int csiIdx = lua_gettop(L);
lua_pushnumber(L, sourceOrdinal);
lua_pushstring(L, cs->source);
lua_rawset(L, csiIdx);
lua_pushnumber(L, lineOrdinal);
lua_pushnumber(L, cs->line);
lua_rawset(L, csiIdx);
lua_pushnumber(L, methodOrdinal);
if (cs->method->isMethod())
{
lualoom_pushnative<MethodInfo>(L, (MethodInfo *)cs->method);
}
else if (cs->method->isConstructor())
{
lualoom_pushnative<ConstructorInfo>(L, (ConstructorInfo *)cs->method);
}
else
{
lmAssert(0, "Attempting to debug non-method %s:%s",
cs->method->getDeclaringType()->getFullName().c_str(), cs->method->getName());
}
assert(lua_istable(L, -1));
lua_rawset(L, csiIdx);
lua_rawset(L, -3);
}
lua_pop(L, 1);
// pop the vector table
lsr_vector_set_length(L, -1, nstack);
lmAssert(lua_gettop(L) - top == 1, "getCallStack - stack wasn't properly cleaned up");
return 1;
}
/*
* Static methods use the lsr_method closure which is generated at class initialization time
* Instance methods are bound to a generated lsr_method closure the first time the method is referenced (at runtime)
* lsr_method is a thin wrapper which handles catching native calls for profiling, default arguments, etc
*/
int lsr_method(lua_State *L)
{
int nargs = lua_gettop(L);
MethodBase *method = (MethodBase *)lua_topointer(L, lua_upvalueindex(1));
bool staticCall = method->isStatic();
if (staticCall)
{
lua_pushvalue(L, lua_upvalueindex(2));
lua_insert(L, 1); // method
}
else
{
lua_pushvalue(L, lua_upvalueindex(2));
lua_insert(L, 1); // this (can be a loomscript table or luabridge userdata
lua_pushvalue(L, lua_upvalueindex(3));
lua_insert(L, 1); // method
}
int dargs = nargs;
int fidx = method->getFirstDefaultParm();
int varArgIdx = method->getVarArgIndex();
int varArgVectorIdx = lua_gettop(L);
// don't consider the varargs in when
// checking whether we need to insert default arguments
if ((fidx != -1) && (varArgIdx != -1))
{
dargs--;
}
if (dargs < method->getNumParameters())
{
// TODO: Report line numbers LOOM-603
// if we have var args and not enough parameters, VM will insert null for ...args value
// otherwise, we have a compiler error
if (varArgIdx < 0)
{
lmAssert(fidx >= 0, "Method '%s::%s' called with too few arguments.", method->getDeclaringType()->getFullName().c_str(), method->getStringSignature().c_str());
}
bool inserted = false;
for (int i = dargs; i < method->getNumParameters(); i++)
{
if (i == varArgIdx)
{
break;
}
lua_pushvalue(L, lua_upvalueindex(i - fidx + (staticCall ? 3 : 4)));
inserted = true;
nargs++;
}
// if we inserted *and* have var args, we
// need to shift the var args to the end
if (inserted && (varArgIdx != -1))
{
lua_pushvalue(L, varArgVectorIdx);
lua_remove(L, varArgVectorIdx);
}
}
LSLuaState *ls = LSLuaState::getLuaState(L);
// error handling
lua_getglobal(L, "__ls_traceback");
lua_insert(L, 1);
if (lua_pcall(L, nargs + (staticCall ? 0 : 1), LUA_MULTRET, 1))
{
ls->triggerRuntimeError("Error calling %s:%s", method->getDeclaringType()->getFullName().c_str(), method->getName());
}
// get rid of the traceback
lua_remove(L, 1);
int nreturn = lua_gettop(L);
if (nreturn == 1)
{
if (method->isNative() && method->isMethod() && lua_isuserdata(L, -1))
{
lualoom_pushnative_userdata(L, ((MethodInfo *)method)->getReturnType(), -1);
}
}
return nreturn;
}
MethodBase *LSProfiler::getTopMethod(lua_State *L)
{
int top = lua_gettop(L);
lua_Debug stack;
// if we get a null result here, we are out of stack
if (!lua_getstack(L, 0, &stack))
{
lua_settop(L, top);
return NULL;
}
if (!lua_getinfo(L, "f", &stack))
{
lua_settop(L, top);
return NULL;
}
bool iscfunc = false;
if (lua_iscfunction(L, -1))
{
iscfunc = true;
}
#ifdef LOOM_ENABLE_JIT
// We do not receive line return hooks for native calls under JIT :(
// So, if we want to profile native methods, we need to be under interpreted VM
if (iscfunc)
{
lua_settop(L, top);
return NULL;
}
#endif
lua_rawgeti(L, LUA_GLOBALSINDEX, LSINDEXMETHODLOOKUP);
lua_pushvalue(L, -2);
lua_rawget(L, -2);
if (lua_isnil(L, -1))
{
lua_settop(L, top);
return NULL;
}
MethodBase *methodBase = (MethodBase *)lua_topointer(L, -1);
lua_settop(L, top);
if (iscfunc && !methodBase->isNative())
{
return NULL;
}
if (shouldFilterFunction(methodBase->getFullMemberName()))
{
return NULL;
}
return methodBase;
}
