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Fixed: the game could crash while resolving expressions in some places

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Leonard2 2016-08-04 19:58:57 +02:00 committed by Christoph Oelckers
parent 4a859393fe
commit 73d0ed78fe
2 changed files with 40 additions and 17 deletions
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24
src/thingdef/thingdef.cpp
View file

@ -361,16 +361,20 @@ static void FinishThingdef()
if (sfunc == NULL)
{
FCompileContext ctx(ti);
dmg->Resolve(ctx);
VMFunctionBuilder buildit;
buildit.Registers[REGT_POINTER].Get(1); // The self pointer
dmg->Emit(&buildit);
sfunc = buildit.MakeFunction();
sfunc->NumArgs = 1;
sfunc->Proto = NULL; ///FIXME: Need a proper prototype here
// Save this function in case this damage value was reused
// (which happens quite easily with inheritance).
dmg->SetFunction(sfunc);
dmg = static_cast<FxDamageValue *>(dmg->Resolve(ctx));
if (dmg != nullptr)
{
VMFunctionBuilder buildit;
buildit.Registers[REGT_POINTER].Get(1); // The self pointer
dmg->Emit(&buildit);
sfunc = buildit.MakeFunction();
sfunc->NumArgs = 1;
sfunc->Proto = NULL; ///FIXME: Need a proper prototype here
// Save this function in case this damage value was reused
// (which happens quite easily with inheritance).
dmg->SetFunction(sfunc);
}
}
def->Damage = sfunc;

33
src/thingdef/thingdef_parse.cpp
View file

@ -191,7 +191,12 @@ static void ParseConstant (FScanner &sc, PSymbolTable *symt, PClassActor *cls)
FxExpression *expr = ParseExpression (sc, cls, true);
sc.MustGetToken(';');
if (!expr->isConstant())
if (expr == nullptr)
{
sc.ScriptMessage("Error while resolving constant definition");
FScriptPosition::ErrorCounter++;
}
else if (!expr->isConstant())
{
sc.ScriptMessage("Constant definition is not a constant");
FScriptPosition::ErrorCounter++;
@ -247,16 +252,24 @@ static void ParseEnum (FScanner &sc, PSymbolTable *symt, PClassActor *cls)
if (sc.CheckToken('='))
{
FxExpression *expr = ParseExpression (sc, cls, true);
if (!expr->isConstant())
if (expr != nullptr)
{
sc.ScriptMessage("'%s' must be constant", symname.GetChars());
FScriptPosition::ErrorCounter++;
if (!expr->isConstant())
{
sc.ScriptMessage("'%s' must be constant", symname.GetChars());
FScriptPosition::ErrorCounter++;
}
else
{
currvalue = static_cast<FxConstant *>(expr)->GetValue().GetInt();
}
delete expr;
}
else
{
currvalue = static_cast<FxConstant *>(expr)->GetValue().GetInt();
sc.ScriptMessage("Error while resolving expression of '%s'", symname.GetChars());
FScriptPosition::ErrorCounter++;
}
delete expr;
}
PSymbolConstNumeric *sym = new PSymbolConstNumeric(symname, TypeSInt32);
sym->Value = currvalue;
@ -568,7 +581,13 @@ static void ParseUserVariable (FScanner &sc, PSymbolTable *symt, PClassActor *cl
if (sc.CheckToken('['))
{
FxExpression *expr = ParseExpression(sc, cls, true);
if (!expr->isConstant())
if (expr == nullptr)
{
sc.ScriptMessage("Error while resolving array size");
FScriptPosition::ErrorCounter++;
maxelems = 1;
}
else if (!expr->isConstant())
{
sc.ScriptMessage("Array size must be a constant");
FScriptPosition::ErrorCounter++;