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- fixed: FxPreIncrDecr depended on undefined compiler behavior.

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It could only work with right to left function argument processing, but with left to right it failed because the ParseExpressionA call altered sc.TokenType.
Note that with register-based arguments on 64 bit platforms this is a very critical issue!
This commit is contained in:
Christoph Oelckers 2016-09-06 08:41:13 +02:00
parent 954ac8ce5e
commit 3ce25bc348
1 changed files with 3 additions and 2 deletions
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5
src/thingdef/thingdef_exp.cpp
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@ -309,7 +309,8 @@ static FxExpression *ParseExpressionC (FScanner &sc, PClassActor *cls)
static FxExpression *ParseExpressionB (FScanner &sc, PClassActor *cls) static FxExpression *ParseExpressionB (FScanner &sc, PClassActor *cls)
{ {
sc.GetToken(); sc.GetToken();
switch(sc.TokenType) int token = sc.TokenType;
switch(token)
{ {
case '~': case '~':
return new FxUnaryNotBitwise(ParseExpressionA (sc, cls)); return new FxUnaryNotBitwise(ParseExpressionA (sc, cls));
@ -325,7 +326,7 @@ static FxExpression *ParseExpressionB (FScanner &sc, PClassActor *cls)
case TK_Incr: case TK_Incr:
case TK_Decr: case TK_Decr:
return new FxPreIncrDecr(ParseExpressionA(sc, cls), sc.TokenType); return new FxPreIncrDecr(ParseExpressionA(sc, cls), token);
default: default:
sc.UnGet(); sc.UnGet();